package com.wuliupai.delivery.wuliupaidelivery.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Descriptions：MD5加密工具
 * <p>
 * Author：ChenME
 * Date：11/29/2016
 * Email：ibelieve1210@163.com
 */
public class MD5 {
    // 全局数组
    private final static String[] strDigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    public MD5() {
    }

    // 返回形式为数字跟字符串
    private static String byteToArrayString(byte bByte) {
        int iRet = bByte;

        if (iRet < 0) {
            iRet += 256;
        }

        int iD1 = iRet / 16;
        int iD2 = iRet % 16;

        return strDigits[iD1] + strDigits[iD2];
    }

    // 转换字节数组为16进制字串
    private static String byteToString(byte[] bByte) {
        StringBuffer sBuffer = new StringBuffer();

        for (int i = 0; i < bByte.length; i++) {
            sBuffer.append(byteToArrayString(bByte[i]));
        }

        return sBuffer.toString();
    }

    public static String GetMD5Code(String strObj) {
        String resultString = null;

        try {
            resultString = new String(strObj);
            MessageDigest md = MessageDigest.getInstance("MD5");
            // md.digest() 该函数返回值为存放哈希值结果的byte数组
            resultString = byteToString(md.digest(strObj.getBytes()));
        } catch (NoSuchAlgorithmException ex) {
            ex.printStackTrace();
        }

        return resultString;
    }
}